JPH1066913A - Method for coating planar material having rugged surface and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the control of coating amts., maintenance and management and to improve workability by providing the mid-ways of connecting paths of a coating material tank and injection nozzles with liquid transfer means for each of the injection nozzles and executing the injection of the coating materials while controlling the coating material supplying rates of the liquid transfer means. SOLUTION: The injection nozzles 2 are respectively connected via connecting pipes 7 to individual gear pumps 6 (liquid feed means) in a metering section 5. The metering section 5 is constituted by integrally connecting the plural gear pumps 6 via the connecting pipes 8 to a coating material tank 9. The coating material supply rates of the respective gear pumps 6 are controlled by the signals of a control section 10. As a result, the gear pumps 6 take out the respective required amts. of the coating materials respectively independently from the coating material tank 9 and supply to the respective injection nozzles 2. As a result, the long-term stable operation is made possible and the intervals of the maintenance and management is prolonged. In addition, the accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for applying a plate material having an uneven surface by a spray coating method.

[0002]

2. Description of the Related Art Various kinds of coatings are applied to building materials used as outer wall materials and inner wall materials of buildings in order to improve commercial value such as designability and weather resistance. Painting work on such a building material is relatively easy in the case of a building material having a flat surface, but in the case of a building material having an unevenness of about 2 to 10 mm on the surface, it is necessary to change the coating amount according to the unevenness. Yes, for example, when painting a plurality of colors, the first color is applied over the entire surface by a curtain coating method or a spray coating method, and then the other color is applied to a convex surface by a roller coating method, which is troublesome. .

However, among the above-mentioned coating methods, in particular, in the spray coating method, since the amount of coating can be arbitrarily adjusted by controlling the spraying, it is possible to perform advanced coating such as shading of light and shade or coating of a fine pattern. Therefore, it is very effective as a coating means for building materials having an uneven surface as described above. However, in the conventional spray coating method, the amount of coating by spraying is controlled by an opening / closing valve, and frequent opening / closing operations need to be performed, so that the opening / closing valve is severely deteriorated and maintenance management must be performed frequently. Therefore, there is a disadvantage that the workability is reduced and the cost is extremely increased.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for coating a plate-like material having an uneven surface, which facilitates control of the amount of coating and maintenance management by using a spray coating method, thereby improving workability. It is to provide a device.

[0005]

According to the present invention, there is provided a method for coating a plate-like material having an uneven surface, wherein a plurality of spray nozzles connected to a paint tank face the surface of the plate-like material to be coated. Liquid feeding means is attached to each of the spray nozzles in the middle of the connection path of the spray nozzles with respect to the paint tank, and the spray is sprayed from the spray nozzles onto the surface to be coated while controlling the amount of paint supplied to each of the liquid sending means. Is what you do.

Further, in the coating apparatus for a plate-like material having an uneven surface according to the present invention, a plurality of spray nozzles connected to the paint tank face the surface to be coated of the plate-like material to be coated. A liquid feeding means is provided for each of the injection nozzles in the middle of the connection path of the injection nozzles, and a control unit for controlling the supply amount of the paint is connected to each of the liquid feeding means.

According to another aspect of the present invention, there is provided an apparatus for coating a plate-like material having an uneven surface, wherein a plurality of spray nozzles connected to a paint tank face the surface of the plate-like material to be coated. A liquid feeding means is provided for each of the injection nozzles in the middle of the connection path of the injection nozzle with respect to the tank, and a connection path cross-sectional area control means is provided in a portion close to the injection nozzle in a connection path between the liquid feeding means and the injection nozzle. And a control unit for controlling the liquid supply amount and the connection passage cross-sectional area of each of the liquid feeding means and the connection passage cross-section control means in conjunction with each other is connected.

As described above, according to the present invention, when performing the coating by the spray coating method, the liquid supply means is used as the control means of the injection amount from the injection nozzle, and the paint supply amount is controlled. Since there is no mechanically degraded part such as the on-off valve, the maintenance management interval can be extended, and stable operation can be ensured for a long period of time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, as a liquid feeding means used for controlling an injection amount of an injection nozzle, a pump is specifically preferable, and particularly, a precise and excellent measuring property such as a gear pump and a roller pump is used. Are preferred. Since the liquid sending means represented by the pump has no mechanically degraded parts, stable operation can be performed for a long time,
The maintenance interval can be extended. Moreover, since it has a precise weighing function, it is possible to control the supply amount with high accuracy.

If the connection path between the liquid sending means and the injection nozzle is long, even if the injection amount is changed in the liquid sending means, a time delay occurs until the injection amount from the injection nozzle changes. If there is a time delay in the change of the injection amount, it becomes difficult to paint with high designability. In view of this, a method of providing a connection path cross-sectional area control means such as a motor-operated valve in the connection path near the injection nozzle and performing the control of the injection amount with high responsiveness in conjunction with the liquid supply means may be adopted.

Although the injection nozzle is not particularly limited, for example, a nozzle having a double-pipe structure, in which paint is passed through an inner pipe and air for atomization is passed through an outer pipe is used. be able to. With such a structure,
By changing the supply pressure of the atomizing air, the particle size of the atomized droplets can be changed, so that a paint with a higher design quality can be obtained.

In the present invention, more preferably, a sensor for detecting the height of the unevenness of the surface to be coated of the plate-like material to be coated is provided at or near the spray nozzle, and the control unit detects the height of the unevenness detected by the sensor. It is preferable to provide a calculation unit for calculating the amount of paint supplied by the liquid sending means based on the signal. With such a configuration, when the sensor detects the height of the unevenness of the surface to be coated, the calculation unit calculates the amount of paint supply to the injection nozzle provided with the sensor based on the detection signal, and sends the corresponding amount of paint to the injection nozzle. Command liquid means. The liquid feeding means supplies the calculated supply amount of the paint to the spray nozzle, and sprays the paint from the spray nozzle to the surface to be coated to perform the coating.

Therefore, according to the coating apparatus having the above configuration, even if the size of the plate material to be coated expands or contracts or the position of the plate material to be coated shifts while being transported, the surface to be coated is not affected. Does not cause paint slippage. Although the sensor is not particularly limited, for example, a sensor that detects the unevenness of the surface to be coated based on the reflection amount or reflection time of light or ultrasonic waves can be used.

As a coating pattern to be applied to the surface to be coated, a storage unit may be provided in the control unit, and a pattern previously stored in the storage unit may be extracted. Further, it is preferable to connect a reader for reading a previously designed painting pattern into the storage unit to the control unit. Further, in order to perform more natural coating, it is preferable to randomize the amount of the coating material to be coated per unit area, and it is preferable to connect a random number generator to the control unit in order to perform the randomization.

The injection nozzles used in the present invention may have a structure in which the mounting positions are fixed, but each of them can move up and down, left and right, back and forth independently or in conjunction with each other, or in any direction. It may be configured to swing. When the positions of the plurality of injection nozzles are fixed, the arrangement pitch is limited. Therefore, when painting with a finer pattern or shading is performed, a huge number of injection nozzles are required. However, when the ejection nozzles are movable, the coating range of each ejection nozzle can be widened, so that a small number of ejection nozzles can obtain a fine pattern or a gradation effect. In addition, a large number of plate-shaped materials can be coated in a short time with an arrangement of a small number of injection nozzles.

It is desirable that the range in which the movable injection nozzle can be moved is set within 10 mm, preferably within the range of 3 to 5 mm. As a drive mechanism of the movable injection nozzle, for example, a gear, a screw, a slider, a piston, and the like may be appropriately combined. The movement can be controlled by using a known control device such as a sequencer or a personal computer.

Hereinafter, a specific description will be given with reference to the embodiment of the present invention shown in the drawings. FIG. 1 shows an example of a coating apparatus using a spray coating method according to the present invention, wherein 1 is a conveyor, 2 is a plurality of jet nozzles arranged in a row, and M is a plate-shaped material to be coated. The plate-shaped material M has an uneven surface to be coated. The surface of the plate-shaped material M has a large number of brick-like projections 3 and a plurality of grooves 4 which are divided vertically and horizontally around the periphery.

The transport conveyor 1 is configured to continuously transport a large number of plate-shaped materials M in a direction indicated by an arrow F with a plurality of plate-shaped materials M placed thereon at fixed intervals. The plurality of injection nozzles 2 are provided in a row so as to cross over the conveyor 1, and their injection ports face the conveyor 1 and the surface to be coated of the plate material M placed thereon. doing. In this embodiment, the plate-shaped material M that has been entirely coated in advance is conveyed, and only the surface of the convex portion 3 of the plate-shaped material M that has been fully coated is selectively sprayed from the spray nozzle 2 to be painted. It has become.

The plurality of injection nozzles 2 arranged in one line
Each is connected to an individual gear pump 6 (liquid sending means) in the measuring section 5 via a connecting pipe 7, and the measuring section 5 is connected to a paint tank 9 via a connecting pipe 8 such that a plurality of gear pumps 6 are collectively provided. Are linked. Therefore, each of the gear pumps 6 independently takes out a required amount of paint from the paint tank 9 and weighs and supplies the paint, and injects it from the injection nozzles 2 in a connection relationship corresponding to the gear pump 6. The paint supply amount of the gear pump 6 is controlled by a signal from the control unit 10.

The spray nozzle 2 has a double pipe structure, in which paint is passed through an inner pipe and air for atomization is passed through an outer pipe. The paint supplied from the gear pump 6 flows through the connecting pipe 7 to the pipe inside the injection nozzle 2. Injection nozzle 2
The air is supplied from the air supply source 16 through the connecting pipe 17 to the pipes on the outer peripheral side through the connecting pipes 18 branched to the respective injection nozzles 2.

The diameter of the injection nozzle 2 is 0.5 to 3 for the inner pipe.
The diameter of the outer tube is preferably about 1.5 mm to 4 mm, but the diameter may be changed according to the amount of jet. If the supply pressure of the air is about 0.3 MPa, the paint is neatly atomized. Although not shown, an electric valve may be provided in the connection pipe 18 to control the atomization state of each injection nozzle.

On the other hand, each of the plurality of injection nozzles 2 has a sensor 1 for individually detecting the height of unevenness on the surface of the plate material M.
2 are installed. These sensors 12 emit light such as infrared rays toward the coated surface of the plate-shaped material M, receive reflected light that changes in accordance with the surface depth of the coated surface, and correspond to the amount of received light. It is configured to convert the electric signal into a strong electric signal. The electric signal is input to the calculation unit 11 of the control unit 10, and commands the presence or absence of the injection of the pump 6 and the supply amount according to the coating pattern calculated by the calculation unit 11. In this embodiment, it is instructed to inject only the ejection nozzle 2 of the sensor 12 that has detected the convex portion 3 and supply amount thereof.

The arithmetic unit 11 is provided with a storage unit 13 in which a preset paint pattern is stored, and a signal calculated based on the paint pattern by an electric signal from the sensor 12 is stored. Each pump 6 is instructed. The control unit 10 includes the storage unit 13
A reader 15 is connected to store a pre-designed coating sample pattern. Further, a random number generation unit 14 is connected to the control unit 10 as means for randomizing the injection by the coating pattern.

FIG. 2 exemplifies an electric signal generated when the sensor 12 attached to the injection nozzle 2 detects the surface irregularity as described above. The output becomes smaller as the detection target is located farther from the injection nozzle 2. ing. That is, the region A on the horizontal axis (time) is an electric signal obtained by converting the reflected light from the conveyor 1 where the plate material M does not exist, and the region B
Is an electric signal obtained by converting light reflected from the groove 4 of the plate material M, and an area C is an electric signal obtained by converting light reflected from the surface of the convex portion 3 closest to the injection nozzle 2. is there.

The electric signals A, B, C are calculated by the arithmetic unit 11
Is input to the storage unit 13, the arithmetic unit 11 issues an instruction on the necessity of ejection and supply amount corresponding to the electric signals A, B, and C based on the coating pattern set in advance in the storage unit 13. For example, in the control for painting only the brick-shaped convex portion 3 as described above, only when an electric signal of the region C is received, a command for driving and supplying the gear pump 6 is issued.

The control for driving only when the signal is in the area C is as follows.
The arithmetic unit 11 may have a simple setting in which a control command is issued only when a signal in the area C is input.
A painting pattern for issuing a control command for all of the signals B and C may be stored. As a method of storing the paint pattern, a sample pattern designed in advance may be read from the reader 15 and stored in the storage unit 13.

Further, if a random number generator 14 is connected to the controller 10, the coating performed only on the convex portion 3 can be made a more realistic brick-like coating. That is,
The convex portion having a real brick tone is a convex portion 3 'having a random shading pattern as shown in FIG. Therefore, in the case of the convex portion 3 having a flat surface as shown in FIG. 4, the electric signal detected from the sensor 12 is in a flat and stable state as shown in a region C in FIG. The electric signal detected by the sensor 12 of the convex portion 3 ′ has a randomly disturbed characteristic as shown in a region C shown in FIG.

Even with the characteristics shown in FIG. 6, it is possible to determine the unevenness by moving average processing of the output electric signal. There are countless random shade patterns of bricks. Therefore, as a method for realizing a coating closer to natural brick pattern, the electric signal of region C obtained in FIG. 2, further finely divided into n equal parts as shown in FIG. 3, c ₀
... Divide like c _n . A random number generated by the random number generator 14 is input to the calculation unit 11 for each of the divided regions, and the calculation unit 11 sets a predetermined ejection amount (supply amount) corresponding to the random number. The value is converted to a value and commanded to the pump 6. When the paint is ejected from the ejection nozzle 2 in accordance with the supply amount randomized by the random number in this manner, the convex portion 3 is painted in a state close to nature.

In the above-described embodiment, the case where a single color shading pattern is applied has been described. However, the present invention can be applied to the application of a plurality of colors. In the case of applying to paint of a plurality of colors, a series consisting of a measuring section 5 and a plurality of spray nozzles 2 connected to a paint tank 9 is constituted into a plurality of series by the number of a plurality of colors to be painted, and these are conveyed on a conveyor 1. May be arranged along the transport direction of the image.

Another method is to arrange a plurality of the coating apparatuses 1 in the transport direction of the four coated plates 8. Each of the paint containers is filled with yellow, magenta, cyan, and black paints. With such a configuration, colors can be freely expressed by a combination of four colors. In this way, many colors can be easily expressed with a small number of nozzle sets. Further, in the illustrated embodiment, the plurality of injection nozzles 2 are arranged in one row. However, this arrangement is not necessarily required to be one row, and as shown in FIG. It may be arranged. Further, the injection nozzle 2 may have a structure fixed at a predetermined position. However, as shown by arrows in FIG. 7, the individual injection nozzles 2 move back and forth, right and left, up and down within a certain range, Alternatively, the user may swing forward, backward, left, right, or in any direction. When the ejection nozzles are made movable in this way, even a small number of ejection nozzles can obtain a blurring effect due to a fine pattern or shading. Further, the coating of a large-area plate-like material can be performed in a short time with a small number of spray nozzles.

In order to be able to move back and forth, left and right, etc., it is necessary to prevent the injection nozzles from interfering with each other due to the movement. Therefore, the arrangement structure of multiple injection nozzles
It is advantageous to form a staggered shape as shown in FIG. The above-described coating method and apparatus of the present invention can be applied to coating of a plate-like material having irregularities on its surface, including building materials,
It can be applied to all kinds of industrial materials such as cloth, film, side and top surfaces of automobiles and containers. Among these, it is particularly effective for building materials.

Here, the building material refers to a building material such as an outer wall material, an inner wall material, an exterior material, and an interior material made of wood, stone, metal, cement, ceramic and the like. In addition, this building material includes roofing materials in the form of tiles, slate, and cement, which are mixed and molded, tiles for interior and exterior decoration (gable, curtain), display members such as nameplates and signboards, and transparent materials such as window glass. It shall include building materials.

[0033]

As described above, according to the present invention, the coating is performed by the spray coating method. However, since the liquid feeding means is used as the means for controlling the amount of the paint supplied to the injection nozzle, it is mechanically required. Since there is no part that deteriorates and the maintenance management interval can be extended, stable operation can be performed for a long period of time.

In the case where a sensor for detecting irregularities on the surface to be coated is provided at or near the injection nozzle and the control unit controls the amount of injection from the injection nozzle based on the detection signal, the plate material to be coated expands and contracts. Even when it is deformed or a position shift occurs due to the conveyance of the conveyance conveyor, it is possible to perform the painting with high design without causing the coating misalignment. Furthermore, since the coating method and apparatus as described above are used, a building material having excellent design properties can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic view of a coating apparatus according to an embodiment of the present invention.

FIG. 2 is a graph showing electric signal characteristics of a sensor attached to an injection nozzle.

FIG. 3 is a graph showing another electric signal characteristic of the sensor.

FIG. 4 is an explanatory view showing a cross section of the surface of a plate material to be coated.

FIG. 5 is an explanatory diagram showing a cross section of the surface of another plate material to be coated.

FIG. 6 is a graph showing another electric signal characteristic of a sensor attached to the injection nozzle.

FIG. 7 is a perspective view illustrating the arrangement of the injection nozzles according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyor 2 Injection nozzle 3 Convex part 4 Groove 5 Metering part 6 Gear pump (liquid sending means) 9 Paint tank 10 Control part 11 Operation part 13 Storage part 14 Random number generator 15 Reader M Plate material to be coated

Claims (12)

[Claims] 1. A plurality of spray nozzles connected to a paint tank are opposed to a surface to be coated of a plate material to be coated, and liquid is sent for each spray nozzle in a connection path of the spray nozzle to the paint tank. A method of coating a plate-like material having a concave-convex surface to be sprayed onto the surface to be coated from the spray nozzle while controlling the amount of paint supplied to each of the liquid sending means while attaching the means. 2. A plurality of spray nozzles connected to a paint tank are opposed to a surface to be coated of a plate material to be coated, and liquid is sent for each spray nozzle in a connection path of the spray nozzle to the paint tank. A coating device for a plate-like material having an uneven surface, in which a control unit for controlling a supply amount of a coating material is connected to each of the liquid feeding means, and a means for mounting the same. 3. A plurality of spray nozzles connected to a paint tank are opposed to a surface to be coated of a plate material to be coated, and liquid is sent for each spray nozzle in a connection path of the spray nozzle to the paint tank. Means, a connection path cross-sectional area control means is attached to a portion near the injection nozzle in the middle of the connection path between the liquid supply means and the injection nozzle, and each of the liquid supply means and the connection path cross-section area control means A plate-like material coating device with an uneven surface to which a control unit that controls the supply amount of paint and the cross-sectional area of the connection path in conjunction is connected. 4. A sensor for detecting the height of unevenness of the surface to be coated is provided at or near each of the plurality of spray nozzles, and the control unit includes a calculation unit for calculating a paint supply amount of each of the liquid feeding means. 4. The coating device for a plate-shaped material having an uneven surface according to claim 2, wherein the arithmetic unit calculates the paint supply amount based on a detection signal of the sensor. 5. The liquid supply means is a pump.
4. The coating device for a plate-like material having an uneven surface according to any one of the items 4 to 4. 6. The coating apparatus for a plate-like material having an uneven surface according to claim 3, wherein the connection path cross-sectional area control means is a motor-operated valve. 7. The coating apparatus for a plate-like material having an uneven surface according to claim 2, wherein each of the plurality of injection nozzles is movable within a predetermined range. 8. The coating apparatus for a plate-shaped material having an uneven surface according to claim 2, wherein the control unit is provided with a storage unit for previously storing the variation pattern of the paint supply amount. 9. The coating apparatus for a plate-shaped material having an uneven surface according to claim 2, wherein a reader that reads in advance the variation pattern of the paint supply amount is connected to the control unit. 10. The apparatus for coating a plate-like material having an uneven surface according to claim 8, wherein a random number generator is connected to the control unit. 11. A method of manufacturing a building material for coating a plate-like body by the coating method according to claim 1. 12. A building material manufacturing apparatus equipped with the coating apparatus according to claim 2. Description: